CN1297671C - Blast furnace soaking furnace examination and repair method - Google Patents
Blast furnace soaking furnace examination and repair method Download PDFInfo
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- CN1297671C CN1297671C CNB2005100572552A CN200510057255A CN1297671C CN 1297671 C CN1297671 C CN 1297671C CN B2005100572552 A CNB2005100572552 A CN B2005100572552A CN 200510057255 A CN200510057255 A CN 200510057255A CN 1297671 C CN1297671 C CN 1297671C
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Abstract
The present invention discloses an overhaul method for a blast furnace. The present invention has the steps that first, a height of stock line in the blast furnace is determined, and all of tuyeres and tap holes of the blast furnace are sealed with fire resistant mud in a damping down state without the flameout of the blast furnace; access passages are arranged on a furnace wall; next, sealed work platform is built on the blast furnace; finally, service on damaged positions in the blast furnace is carried out through air inlet and air outlet steel pipes arranged on the sealed work platform. When the present invention is used, the blast furnace needs no flameout and is in a damping down state, and furnace charge does not need to be scratched out from the tuyeres, so the overhaul construction time (ordinarily about 12 days which is half of the ordinary construction time) is greatly shortened. After the completion of the overhaul, normal tapping is carried out after 8 hours of restoring the wind. The restoring production period is obviously accelerated, the problem of ahead of medium repair does not exist, and compared with the existing method, the cost of the whole overhaul process is greatly reduced.
Description
Technical field
The present invention relates to the service technique of steelworks blast furnace, relate to a kind of soaking furnace examination and repair method particularly blast furnace.
Background technology
Steelworks blast furnace maintenance generally be divided into overhaul, in repair, conventional maintenance.Time between overhaul is generally 8-10, and the duration was generally 50-60 days; In the cycle of repairing be generally 4-5, the duration was generally 35-45 days.In the blast-furnace smelting production process, the refractory material furnace lining scaling loss collapses in the stove of stove top (the big flange of furnace roof is following), the throat armour scaling loss, the large and small bell scaling loss of furnace roof can not seal (particularly high pressure stove), as long as more than wherein any one position go wrong, will influence production, the maintenance that is forced to stop, conventional maintenance that Here it is.
Traditional routine maintenance scheme, its step is roughly: blast furnace is ceased fire earlier, raw material in the stove is clawed from the stove air port again, sets up workplatform according to the maintenance position then, carries out the maintenance of damaged part at last.Workplatform is the place that the maintainer stands in the whole maintenance process, it generally comprises three layers, is followed successively by the joist steel support from bottom to up---channel-section steel secondary beam---steel plate (generally selecting the thick general steel of 4mm).Blast furnace will stop working, furnace charge will claw is in order to guarantee maintainer's safety, according to above-mentioned examination and repair method, if it is flame-out, do not take off material, because the furnace charge burning process can produce gas, stockpiled for a long time and can not effectively have been discharged, gas may explode, even do not explode, overflows the gas that comes and also may cause carbon monoxide poisoning.Carry out the routine maintenance according to the method described above, though security is guaranteed that by stopping working, take off material the duration is longer, generally about 25-30 days; And when blast furnace resumes production, because ceased fire and empty furnace charge, need charging again, heat up again, reaching the time of normally tapping a blast furnace needs about 3 days.What is more, sometimes after blast furnace lowers from high temperature, refractory material furnace lining, stove cooling stave (steel casting) can occur bursting because of the reason of expanding with heat and contract with cold (the interior temperature of stove was about 1000 degree when blast furnace was produced) in the stove, need to change, this will force whole blast furnace to be repaiied in carrying out in advance, waste material and equipment part, claim for eot, expense significantly increases.
Summary of the invention
Exist maintenance duration long at the conventional examination and repair method of prior art blast furnace, and reproduce the deficiency of length consuming time, purpose of the present invention just provides the conventional examination and repair method of a kind of brand-new blast furnace, and it can shorten maintenance duration, and can reproduce very soon under the premise that security is guaranteed.
The object of the present invention is achieved like this: blast furnace soaking furnace examination and repair method may further comprise the steps:
1, the height of the workplatform that will build according to maintenance position decision again according to the height of charge level in the height decision stove of workplatform, makes in the stove charge level apart from the workplatform bottom 1.2-1.5 rice that will build.
2, do not stop working, be at stove under the damping down state, all air ports of stove, iron notch are shut with refractory mortar.
3, on the furnace wall, offer access way.
4, build sealing, heat insulation workplatform on stove, workplatform is positioned at the access way bottom.
5, pass workplatform bottom and draw and establish the inlet, outlet steel pipe, inlet, outlet steel pipe upper end is passed access way and is picked out the stove outside.
6, the large and small bell of inner lining of furnace refractory materials, throat armour and furnace roof is overhauled.
Above-mentioned workplatform comprises four layers at least, is followed successively by from the bottom to top: constitute steelframe basic unit by cross one another channel-section steel or joist steel; The steel plate that is layed in the basic unit is the second layer; The woven asbesto that thickness is not less than 3mm is the 3rd layer, seals in a down-to-earth manner with refractory mortar around the woven asbesto; Fine sand is the 4th layer, and its thickness is not less than 200mm.
Further improve being, be positioned at stove outside section at the steel pipe of giving vent to anger and be parallel with compressed air pipe, compressed air pipe merges with the air-flow of the steel pipe of giving vent to anger.
Adopt above-mentioned examination and repair method because flame-out, do not take off material, and workplatform is very tight to the furnace charge sealing, coal gas is derived by escape pipe fully in the stove, so be referred to as to boil in a covered pot over a slow fire stove.The setting of inlet pipe and compressed air pipe, it is more thorough that gas is derived, and can any threat do not arranged to the maintenance worker, and security is quite high.Need not stop working during maintenance, make stove be in the damping down state and get final product, also furnace charge need not be clawed from the air port, maintenance duration shortens dramatically, and generally about 12 days, shortens half more in the past.Maintenance finishes, and removes workplatform in the stove, opens the air port, iron notch can reproduce, and generally wind can normally tap a blast furnace in 8 hours again, and blast furnace returns to normal production, and the cycle that reproduces obviously accelerates.Because flame-out, furnace interior spare fried phenomenon can not occur splitting because of expanding with heat and contract with cold, and repaiies problem in not existing in advance, and the expense of whole maintenance process is declined to a great extent than before.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing:
The structural representation of blast furnace when Fig. 1 is maintenance.
Fig. 2 is the structural representation of workplatform.
Embodiment
Can be when implementing present method with reference to figure 1, Fig. 2, to help understanding, 1-workplatform wherein, the 2-inlet pipe, 3-escape pipe, 4-furnace charge, the 5-air port, 6-iron notch, 7-compressed air pipe, the big flange of 8-furnace roof, 11-joist steel strutbeam, 12-channel-section steel secondary beam, 13-steel plate, the 14-woven asbesto, 15 river sands.
Introduce the concrete steps of blast furnace soaking furnace examination and repair method of the present invention below in detail:
1, at first determines the height of charge level in the stove, make the workplatform bottom 1.2-1.5 rice that the charge level distance will be built in the stove, and the height of workplatform is according to the decision of maintenance position.
2, do not stop working, be at stove under the damping down state, all air ports of stove and iron notch are shut with refractory mortar.
3, offer access way on the furnace wall, this passage is for workmen and material turnover.
4, building platform, workplatform is positioned at the access way bottom.The steps include: A, according to the height of maintenance position decision workplatform in the stove, charge level 1.2-1.5 rice in this height distance stove.The height that present embodiment is selected is 1.5 meters, therefore opens four holes apart from the height of 1.5 meters of charge levels in the stove on stove, and interspersed 2 32# joist steel in the hole are as the workplatform the first layer.B, lay the 10# channel-section steel as the workplatform second layer on the first layer 32# joist steel, second layer channel-section steel and the first layer joist steel intersect, and the gap of channel-section steel is 0.4 meter.C, on second layer channel-section steel, lay the steel plate of δ=4mm as the 3rd layer of workplatform.D, on three-ply plate, completely spread thickness be the woven asbesto of 4mm as the 4th layer of workplatform, seal in a down-to-earth manner with refractory mortar around the woven asbesto.The effect of woven asbesto has two: the one, play heat-blocking action, and because stove is not flame-out, temperature is higher in the stove, and woven asbesto is high temperature resistant, heat transmission function is poor; The 2nd, seal, because stove is not flame-out, to produce a large amount of coal gas in the stove.E, completely spread river sand as the workplatform layer 5 on the 4th layer of woven asbesto, the thickness of river sand is 250mm.River sand plays sealing and heat-blocking action, because the crystal grain of river sand is thin, sealing function is very good, and its heat transmission function is poor simultaneously.First, second layer of this workplatform can be referred to as steelframe basic unit, as the bottom of laying the steel plate layer.
5, passing workplatform bottom draws and establishes the inlet, outlet steel pipe, inlet, outlet steel pipe aperture is 76mm, the upper end is passed access way and is picked out the stove outside, and the lower end enters the cavity of stove inner facing material top and makes the depth of penetration shallow 300mm of the depth of penetration of the steel pipe of giving vent to anger than air inlet steel pipe.
Be positioned at the compressed air pipe that stove outside section was parallel with 4 fens at the steel pipe of giving vent to anger, compressed air pipe merges with the air-flow of the steel pipe of giving vent to anger, and the angle of giving vent to anger between steel pipe and the compressed air pipe is 30 degree.Compressed air pipe is to make furnace air to quicken discharging, and it regulates its air quantity by gate valve, and the temperature of escape pipe is high more, and gate valve is opened greatly more, otherwise more little.Like this, discharge, make the gas concentration that produces in the stove below the workplatform be unlikely to too high, guaranteed the safety of workmen in the stove by escape pipe.
6, damaged parts such as inner lining of furnace refractory materials, throat armour and the large and small bell of furnace roof are overhauled.
The serviceman enters workplatform by access way as stated above damaged part is overhauled, and this maintenance is the same with prior art, is not described further.Maintenance finishes, and removes workplatform in the stove, and access way is sealed, with bright again the opening of air port, iron notch of shutting, begin to resume production behind the multiple wind, generally behind multiple wind, can normally tap a blast furnace in 8 hours, stove returns to normal production, and the duration shortens greatly, and expense declines to a great extent.
In the foregoing description, the thickness that workplatform is every layer is preferred version.Its selection has 3 factors to consider: intensity, sealing and heat insulation.As first and second layer consideration be intensity, the label of steel such as little can influence intensity, but also can not be too high, if too high, can form waste, satisfies intensity and gets final product.Third and fourth layer, woven asbesto and river sand play sealing and heat-blocking action, if thickness low LCL, sealing and heat-blocking action do not reach, but can not be too high, if too high, form waste yet, and be especially for valuable woven asbesto, all the more so.Practice shows that an ideal woven asbesto thickness range is 3-5mm, with 4mm the best, because common woven asbesto thickness is 4mm; And an ideal river sand thickness range is 200-300mm.For the first layer, after the label of steel was determined, the density degree of its laying also was that the starting point of selection is the same because of intensity fully.Can certainly consider simultaneously that label and density degree satisfy intensity, as the label height, can spread rarer, otherwise, then spread closeer.
Claims (4)
1, blast furnace soaking furnace examination and repair method is characterized in that: it may further comprise the steps:
1) height of the workplatform that will build according to maintenance position decision again according to the height of charge level in the height decision stove of workplatform, makes in the stove charge level apart from the workplatform bottom 1.2-1.5 rice that will build;
2) do not stop working, be at stove under the damping down state, all air ports of stove and iron notch are shut with refractory mortar;
3) on the furnace wall, offer access way;
4) build sealing, heat insulation workplatform on stove, workplatform is positioned at the access way bottom;
5) pass workplatform bottom and draw and establish the inlet, outlet steel pipe, inlet, outlet steel pipe upper end is passed access way and is picked out the stove outside;
6) the large and small bell of inner lining of furnace refractory materials, throat armour and furnace roof is overhauled.
2, blast furnace soaking furnace examination and repair method according to claim 1 is characterized in that: be positioned at stove outside section at the steel pipe of giving vent to anger and be parallel with compressed air pipe, compressed air pipe merges with the air-flow of the steel pipe of giving vent to anger.
3, blast furnace soaking furnace examination and repair method according to claim 1 and 2 is characterized in that: described workplatform comprises following four layers at least: constitute steelframe basic unit by cross one another channel-section steel or joist steel; The steel plate that is layed in the basic unit is the second layer; Woven asbesto is the 3rd layer, seals in a down-to-earth manner with refractory mortar around the woven asbesto; Fine sand is the 4th layer.
4, blast furnace soaking furnace examination and repair method according to claim 3 is characterized in that: described the 3rd layer of woven asbesto thickness is not less than 3mm; The 4th layer of fine sand thickness is not less than 200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100572552A CN1297671C (en) | 2005-09-05 | 2005-09-05 | Blast furnace soaking furnace examination and repair method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100572552A CN1297671C (en) | 2005-09-05 | 2005-09-05 | Blast furnace soaking furnace examination and repair method |
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| CN1733941A CN1733941A (en) | 2006-02-15 |
| CN1297671C true CN1297671C (en) | 2007-01-31 |
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| CNB2005100572552A Expired - Fee Related CN1297671C (en) | 2005-09-05 | 2005-09-05 | Blast furnace soaking furnace examination and repair method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104480241B (en) * | 2014-12-22 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of method of the banking fast quick-recovery working of a furnace |
| CN114480769B (en) * | 2022-01-28 | 2023-02-10 | 新疆八一钢铁股份有限公司 | Method for treating harmful gas in Ou metallurgical furnace body |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57185907A (en) * | 1981-05-09 | 1982-11-16 | Nippon Steel Corp | Hot relining device for blast furnace wall |
| SU1537783A1 (en) * | 1988-03-29 | 1990-01-23 | Мариупольский Филиал Украинского Государственного Института По Проектированию Металлургических Заводов | Supporting system of blast furnace |
| CN1268578A (en) * | 1999-03-31 | 2000-10-04 | 川崎制铁株式会社 | Construction method and exchanging apparatus for blast furnaces |
| RU2163642C1 (en) * | 2000-02-25 | 2001-02-27 | Открытое акционерное общество совместное предприятие акционерная компания "Тулачермет" | Method of repair of blast-furnace lining |
-
2005
- 2005-09-05 CN CNB2005100572552A patent/CN1297671C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57185907A (en) * | 1981-05-09 | 1982-11-16 | Nippon Steel Corp | Hot relining device for blast furnace wall |
| SU1537783A1 (en) * | 1988-03-29 | 1990-01-23 | Мариупольский Филиал Украинского Государственного Института По Проектированию Металлургических Заводов | Supporting system of blast furnace |
| CN1268578A (en) * | 1999-03-31 | 2000-10-04 | 川崎制铁株式会社 | Construction method and exchanging apparatus for blast furnaces |
| RU2163642C1 (en) * | 2000-02-25 | 2001-02-27 | Открытое акционерное общество совместное предприятие акционерная компания "Тулачермет" | Method of repair of blast-furnace lining |
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| CN1733941A (en) | 2006-02-15 |
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Granted publication date: 20070131 Termination date: 20120905 |